Legrand DX3 thermal magnetic 2-pole 3A circuit-breaker with B-curve protection, 16kA breaking capacity at 230V, IP20 rated, accepts DX³ auxiliaries, ideal for residential and commercial installations.
The Legrand DX3 MCB 2P 3A Curve B is a thermal magnetic circuit-breaker designed to protect wiring installations against overloads and short-circuits with exceptional reliability. This device features a 16kA breaking capacity at 230V and 10kA at 400V, making it suitable for residential and small commercial applications. The circuit-breaker can control and isolate the installation while accepting DX³ auxiliaries for enhanced functionality. With its B-curve release characteristic, it provides fast protection against short-circuits between 3 to 5 times the rated current, ensuring optimal safety for sensitive equipment and wiring systems.
This 2-pole modular device is protected against solid bodies larger than 12.5mm (IP20 according to IEC/EN 60529 standard) and features an energy limitation class 3 according to IEC 60898-1 standard. The MCB can be supplied via copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar, offering flexible installation options. It includes two DIN rail clamps for independent removal and features a label holder for clear circuit identification with on/off indication printed on the handle in red and green backgrounds.
The product is halogen-free and designed in an environmentally conscious process, complying with substance-restriction requirements. It operates at rated voltages up to 400V with an impulse withstand voltage of 4kV and is suitable for ambient temperatures between -25°C and 70°C. The device accepts various DX³ auxiliaries and RCD add-on modules, making it highly adaptable for different installation requirements and future system expansions.
Key Features
- Thermal magnetic protection with B-curve release characteristic (9A-15A short-circuit tripping threshold)
- 16kA breaking capacity at 230V and 10kA at 400V for reliable overcurrent protection
- IP20 protected against solid bodies larger than 12.5mm with energy limitation class 3
- Compatible with DX³ auxiliaries, RCD add-on modules and various connection systems
- Dual DIN rail clamps for independent removal and label holder for circuit identification
- Halogen-free design with environmentally conscious manufacturing process
- Rated impulse withstand voltage of 4kV and operates -25°C to 70°C ambient temperature range
- Flexible supply options via copper cable, prong busbar, fork busbar or HX3 plug busbar
Technical Specifications
| Specification |
Value |
| Product Type | Thermal Magnetic Circuit Breaker |
| Release Characteristic | B Curve (3-5 In) |
| Number of Poles | 2 Poles |
| Rated Current | 3 Amperes |
| Rated Voltage | 400 Volts AC |
| Rated Insulation Voltage | 500 Volts |
| Impulse Withstand Voltage | 4 kV |
| Breaking Capacity at 230V | 16 kA (Icn) |
| Breaking Capacity at 400V | 10 kA (Icn) |
| Ultimate Breaking Capacity at 230V | 32 kA (Icu) |
| Ultimate Breaking Capacity at 400V | 16 kA (Icu) |
| Frequency | 50-60 Hz |
| Current Limiting Class | Class 3 |
| Degree of Protection | IP20 (Fingerproof) |
| Width in Modular Spacings | 2 Modules |
| Built-in Depth | 44 mm |
| Width | 35.4 mm |
| Height | 94.8 mm |
| Total Depth | 77.8 mm |
| Impact Strength | IK02 |
| Operating Temperature Range | -25°C to +70°C |
| Storage Temperature Range | -40°C to +70°C |
| Connectable Conductor Cross Section (Multi-wired) | 1.5-25 mm² |
| Connectable Conductor Cross Section (Solid-core) | 1.5-35 mm² |
| Connection Type | Screwed Terminal |
| Supply Direction | Top or Bottom |
| Mounting Method | DIN Rail |
| Colour | Grey (RAL 7035) |
| Halogen Free | Yes |
| Pollution Degree | 2 |
| Flush-mounted Installation | Yes |
| Concurrently Switching Neutral | No |
| Additional Equipment Possible | Yes (DX³ auxiliaries and RCD modules) |
| Label Space | Yes |
| Explosion-proof | No |
| Reference Number | 408937 |
| EAN Code | 3245064089371 |
| Carbon Footprint (Manufacturing Phase) | 1.748 kg CO₂ eq. |
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